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Fix "keyboard does not respond" bug. Thanks to Peter Krawies (breakoutbox /AT/ web /DOT/ de)

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svn path=/trunk/; revision=25745
This commit is contained in:
Dmitry Gorbachev 2007-02-07 00:29:50 +00:00
parent e6a2b315ca
commit a840459c37
1 changed files with 24 additions and 10 deletions
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34
reactos/boot/freeldr/freeldr/arch/i386/hardware.c
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@ -1925,6 +1925,8 @@ DetectPS2AuxDevice(VOID)
{
UCHAR Scancode;
UCHAR Status;
ULONG Loops;
BOOLEAN Result = TRUE;
PS2ControllerWait();
WRITE_PORT_UCHAR((PUCHAR)CONTROLLER_REGISTER_CONTROL,
@ -1935,31 +1937,43 @@ DetectPS2AuxDevice(VOID)
WRITE_PORT_UCHAR((PUCHAR)CONTROLLER_REGISTER_DATA,
0xF2);
StallExecutionProcessor(10000);
/* Wait for reply */
for (Loops = 0; Loops < 10; Loops++)
{
StallExecutionProcessor(10000);
Status = READ_PORT_UCHAR((PUCHAR)CONTROLLER_REGISTER_STATUS);
if ((Status & CONTROLLER_STATUS_OUTPUT_BUFFER_FULL) != 0)
break;
}
Status = READ_PORT_UCHAR((PUCHAR)CONTROLLER_REGISTER_STATUS);
if ((Status & CONTROLLER_STATUS_MOUSE_OUTPUT_BUFFER_FULL) == 0)
{
return FALSE;
}
Result = FALSE;
Scancode = READ_PORT_UCHAR((PUCHAR)CONTROLLER_REGISTER_DATA);
if (Scancode != 0xFA)
return FALSE;
Result = FALSE;
StallExecutionProcessor(10000);
Status = READ_PORT_UCHAR((PUCHAR)CONTROLLER_REGISTER_STATUS);
if ((Status & CONTROLLER_STATUS_MOUSE_OUTPUT_BUFFER_FULL) == 0)
{
return FALSE;
}
Result = FALSE;
Scancode = READ_PORT_UCHAR((PUCHAR)CONTROLLER_REGISTER_DATA);
if (Scancode != 0x00)
return FALSE;
Result = FALSE;
return TRUE;
/* Flush output buffer */
for (Loops = 0; Loops < 10; Loops++)
{
Status = READ_PORT_UCHAR((PUCHAR)CONTROLLER_REGISTER_STATUS);
if ((Status & CONTROLLER_STATUS_OUTPUT_BUFFER_FULL) == 0)
break;
StallExecutionProcessor(10000);
}
return Result;
}